Building outer wall pipeline support convenient to install and replace and construction method thereof

The invention discloses a building outer wall pipeline support convenient to mount and replace and a construction method thereof, and belongs to the technical field of pipeline mounting. The building outer wall pipeline support comprises a mounting groove, a positioning assembly, a mounting base, a locking piece and a damping assembly; the mounting groove is fixedly formed in a building outer wall; the positioning assembly comprises a positioning plate and a connecting rod; the positioning plates are oppositely arranged on the mounting groove; the two ends of the connecting rod are detachably inserted into the two positioning plates respectively, and clamping plates are arranged on the rod body and correspond to the two sides of the mounting seat; the section of the mounting seat is T-shaped, and the mounting seat comprises a transverse part and a vertical part; the locking piece is arranged on the pipeline and is fixedly connected with the mounting seat; the damping assembly comprises a spring and a flexible